В работу алгоритма поисковой машины заложено отбрасывание, т.е. исключение из индексирования, определённых слов, их часто называют "стоп-слова".

К ним относятся::

1. Цифры:

1,2,3,4,5,6,7,8,9,0

Примечание:

Составные цифры, состоящие из нескольких цифр, например, 941-6023 (номер телефона) не фильтруются.

2. Буквы алфавита:

a, b, с, d, e, f, g, h, i, j, k, 1, m, n, o, p, q, r, s, t, u, v, w, x, y, z

3. Слова, частицы, предлоги, союзы, междометия, вводные слова, местоимения, сочетания букв.

Русскоязычные стоп-слова

Такими словами могут быть предлоги, суффиксы, причастия, междометия и частицы (а, без, более, бы, был, была, были, было, быть, в, вам, вас, весь, во, вот, все, всего, всех, вы, где, да, даже, для, до, его, ее, если, есть, ещё, же, за, здесь, и, из, из-за, или, им, их, к, как, как-то, ко, когда, кто, ли, либо, мне, может, мы, на, надо, наш, не, него, неё, нет, ни, них, но, ну, о, об, однако, он, она, они, оно, от, очень, по, под, при, с, со, так, также, такой, там, те, тем, то, того, тоже, той, только, том, ты, у, уже, хотя, чего, чей, чем, что, чтобы, чьё, чья, эта, эти, это, я), а также целый ряд других слов. Их конкретный перечень может состоять от нескольких сот до нескольких тысяч слов и различен для разных поисковых машин.

Английские стоп-слова

about, above, according, across, actually, ad, adj, ae, af, after, afterwards, ag, again, against, ai, al, all, almost, alone, along, already, also, although, always, am, among, amongst, an, and, another, any, anyhow, anyone, anything, anywhere, ao, aq, ar, are, aren, aren't, around, arpa, as, at, au, aw, az ba, bb, bd, be, became, because, become, becomes, becoming, been, before, beforehand, begin, beginning, behind, being, below, beside, besides, between, beyond, bf, bg, bh, bi, billion, bj, bm, bn, bo, both, br, bs, bt, but, buy, bv, bw, by, bz ca, can, can't, cannot, caption, cc, cd, cf, eg, ch, ci, ck, cl, click, cm, en, со, со., com, copy, could, couldn, couldn't, cr, cs, cu, cv, ex, cy, cz de, did, didn, didn't, dj, dk, dm, do, does, doesn, doesn't, don, don't, down, during, dz each, ec, edu, ее, eg, eh, eight, eighty, either, else, elsewhere, end, ending, enough, er, es, et, etc, even, ever, every, everyone, everything, everywhere, except few, fi, fifty, find, first, five, fj, fk, fm, fo, for, former, formerly, forty, found, four, fr, free, from, further, fx ga, gb, gd, ge, get, gf, gg, gh, gi, gl, gm, gmt, gn, go, gov, gp, gq, gr, gs, gt, gu, gw, gy had, has, hasn, hasn't, have, haven, haven't, he, he'd, he'll, he's, help, hence, her, here, here's, hereafter, hereby, herein, hereupon, hers, herself, him, himself, his, hk, hm, hn, home, homepage, how, however, hr, ht, htm, html, http, hu, hundred i'd, i'll, i'm, i've, i.e., id, ie, if, ii, il, im, in, inc, inc., indeed, information, instead, int, into, io, iq, ir, is, isn, isn't, it, it's, its, itself je,jm,jo,join,jp

ke, kg, kh, ki, km, kn, koo, kp, kr, kw, ky, kz

la, last, later, latter, Ib, Ic, least, less, let, let's, li, like, likely, Ik, 11, Ir, Is, It, ltd, lu, Iv, ly

ma, made, make, makes, many, maybe, me, md, me, meantime, meanwhile, mg, mh, microsoft, might, mil, million, miss, mk, ml, mm, mn, mo, more, moreover, most, mostly, mp, mq, mr, mrs, ms, msie, mt, mu, much, must, mv, mw, mx, my, myself, mz

na, namely, nc, ne, neither, net, netscape, never, nevertheless, new, next, nf, ng, ni, nine, ninety, nl, no, nobody, none, nonetheless, noone, nor, not, nothing, now, nowhere, np, nr, nu, null, nz

of, off, often, om, on, once, one, one's, only, onto, or, org, other, others, otherwise, our, ours, ourselves, out, over, overall, own

pa, page, pe, per, perhaps, pf, pg, ph, pk, pi, pm, pn, pr, pt, pw, re, recent, recently, reserved, ring, ro, ru, rw

sa, same, sb, sc, sd, se, seem, seemed, seeming, seems, seven, seventy, several, sg, sh, she, she'd, she'll, she's, should, shouldn, shouldn't, si, since, site, six, sixty, sj, sk, si, sm, sn, so, some, somehow, someone, something, sometime, sometimes, somewhere, sr, st, still, stop, su, such, sv, sy, sz

taking, tc, td, ten, text, tf, tg, test, th, than, that, that'll, that's, the, their, them, themselves, then, thence, there, there'll, there's, thereafter, thereby, therefore, therein, thereupon, these, they, they'd, they'll, they're, they've, thirty, this, those, though, thousand, three, through, throughout, thru, thus, tj, tk, tm, tn, to, together, too, toward, towards, tp, tr, trillion, tt, tv, tw, twenty, two, tz

ua, ug, uk, um, under, unless, unlike, unlikely, until, up, upon, us, use, used, using, uy, uz va, vc, ve, very, vg, vi, via, vn, vu

was, wasn, wasn't, we, we'd, we'll, we're, we've, web, webpage, website, welcome, well, were, weren, weren't, wf, what, what'll, what's, whatever, when, whence, whenever, where, whereafter, whereas, whereby, wherein, whereupon, wherever, whether, which, while, whither, who, who'd, who'll, who's, whoever, whole, whom, whomever, whose, why, will, with, within, without, won, won't, would, wouldn, wouldn't, ws, www

ye, yes, yet, you, you'd, you'll, you're, you've, your, yours, yourself, yourselves, yt, yu za, zm, zr и другие.

4. Разработчики алгоритма работы конкретной поисковой машины могут расширять или сокращать приведенный список шумовых слов в зависимости от конкретной тематики, задач и назначения поисковой машины.

Источник: http://www.seo-master.su/