馀 is the traditional/orthographic variant of 余 (yú) used to mean 'remainder' or 'surplus'. In simplified Chinese it normally collapses to 余, but 馀 is retained when ambiguity with 余 ('I/me') matters, especially in formal or classical contexts.
memory
Think of 馀 as 'food (饣) + I (余)' — what is left over after I have eaten — i.e. the remainder.
