WHOLE CHARACTER
夏xià
summer — the second season of the year; the Xia dynasty of ancient China; China (华夏); a family name
夏 is summer: 夏天 'summer', 夏季 'summer season', 夏令营 'summer camp'.
ZDIC gives the old 会意 account (页 the head, 臼 the two hands, 攵 the two feet — a human figure). The modern shape instead writes 一 over 自 over the bent 夂 piece; these are shown as written pieces, not as the historical parts.
TOP: A WRITTEN HORIZONTAL
一yī
one
Structural source piece in 百; not every visible stroke-like piece is taught as a separate word.
In 夏: top: a written horizontal Shown with its documented or clearly limited role.
MIDDLE: THE WRITTEN 'SELF' SHAPE — A WRITTEN PIECE HERE
自zì
self; originally also nose
Historical nose/self source in 鼻.
In 夏: middle: the written 'self' shape — a written piece here Shown per the ZDIC stroke order; not taught as the word zì.
BOTTOM: THE BENT WRITTEN PIECE (THE OLD ACCOUNT NAMED 攵 HERE)
夂zhǐ
a bound 'follow/go' graph (dictionary radical)
A bound piece that appears at the top or bottom of several characters; not a standalone modern word.
In 夏: bottom: the bent written piece (the old account named 攵 here) A written piece; not equated with the historical 攵.