KanjiJLPT N2
Illuminate

illuminate, shine, compare, bashful

Mnemonic

A shining orb hovers above a roaring pit of flames. The orb drinks in every tongue of fire and refracts it outward in brilliant rays, combining both forces to illuminate the land so completely that even the deepest caves glow as bright as noon.
Additional thoughts
Picture the shining component on top and flames underneath—mirroring the kanji's actual structure. The orb catches and magnifies the flames, producing total illumination. Top half = shining, bottom half = flames.
Quick recall
A shining orb magnifies roaring flames to illuminate everything.

Details

The keyword for 照 is illuminate. This kanji conveys the idea of shining light upon something, making it bright and visible. It encompasses both the literal sense of casting light, as from the sun or a lamp, and the figurative sense of shedding light on a matter to reveal or clarify it. It is also used in the context of comparing or cross-referencing, as in holding something up to the light for verification.
On'yomi
しょう
Kun'yomi
て.る、て.らす、て.れる