zepti - '1E-21 'zepto' '

zepti
zep 1E-21
 
'1E-21 'zepto' '
 
x1 is 1x10**-21 of x2 in dimension/aspect x3 (default is units) ae 0 (cf. grake, mitre, snidu, stero, delno, molro, kel

(cf. grake, mitre, snidu, stero, delno, molro, kelvo, xampo, gradu. litce, merli, centi, decti, dekto, femti, gigdo, gocti, gotro, kilto, megdo, mikri, milti, nanvi, petso, picti, terto, xatsi, xecto, xexso, zetro)

cf