అచ్చులు
తెలుగులోని అక్షరాలను అచ్చులు, హల్లులు, ఉభయాక్షరాలు అనే మూడు విభాగాలుగా విభజించారు. మొదటి 16 అక్షరాలను అచ్చులు అంటారు. అవి
అబాకస్
The Russian abacus, the "schoty" (счёты), usually has a single slanted deck, with ten beads on each wire (except one wire, usually positioned near the user, with four beads for quarter-ruble fractions). Older models have another 4-bead wire for quarter-kopeks, which were minted until 1916. The Russian abacus is often used vertically, with wires from left to right in the manner of a book. The wires are usually bowed to bulge upward in the center, to keep the beads pinned to either of the two sides. It is cleared when all the beads are moved to the right. During manipulation, beads are moved to the left. For easy viewing, the middle 2 beads on each wire (the 5th and 6th bead) usually are of a different colour from the other eight beads. Likewise, the left bead of the thousands wire (and the million wire, if present) may have a different color.