4 | D

D*
commun. IT	D-star
DS
astr.	diffuse luminous surface
d
gen.	height of reserve layer
fin.	1 penny; 4 farthings

| signal

signal
gen.	signal
chem.	symbol
commun.	code character
commun. el.	feed
el.	waveform; waveshape
ling.	acoustic signal
tech.	survey tower
telecom.	character
transp.	sign

processing - only individual words found