The five axis letters

Letter	English	Español	The question it answers
N	batch / examples	lote / ejemplos	How many independent examples?
T	time	tiempo	How many measured moments?
H	height	alto	How many pixel rows?
W	width	ancho	How many pixel columns?
C	channels	canales	How many colour or measurement channels?

Read (N, T, H, W, C) as a sentence and it stops being cryptic: examples × time × height × width × channels.