LEN

Returns, as an integer, the number of bytes (or characters) of a given string; may also return the number of bytes taken by a numerical variable

Implemented by: dartmouth5, hptsb, decbasic, altair8K, a2int, Applesoft, TI994, CBM, Atari, msatari, level2, trscolor, colormc, zx81, spectrum, Atom, BBC, GWBASIC, MSX, bwbasic, bw32, ABasiC, VBDOS, FreeBASIC, ugBASIC, minibasicmm, minibasicjs, EndBASIC

With variations: QBasic (also for bytes occupied by a variable), Gambas

Also written as: