BSA
Birmingham Small Arms (Co.)

infinitely
infinitely small

modicum
a small modicum of effort

S
Small

sc
small capital

SCSI
small computer systems interface

SIBO
small intestinal bacteria overgrowth 

small
in small numbers

Small Crow
Corvus samarensis

Small Ground Finch
Geospiza fuliginosa

Small Lifou White-eye
Zosterops minutus

Small Minivet
Pericrocotus cinnamomeus

Small Niltava
Niltava macgrigoriae

Small Pratincole
Glareola lactea

Small Tree Finch
Camarhynchus parvulus

Small-billed Elaenia
Elaenia parvirostris

Small-billed Tinamou
Crypturellus parvirostris

Small-headed Elaenia
Elaenia sordida

small-leaved
que tem folhas pequenas

small-minded
mesquinho

small-mindedly
mesquinhamente

small-mindedness
mesquinhez

small-scale
pouco importante

small-size
pequeno

small-sized
pequeno

small-time
pouco importante

small-town
provinciano

SME
Small and Medium-sized Enterprise

SPQR
small profit, quick return

XS
extra-small