記 - Arise and WRITE DOWN Your Dreams in Your Journal

Readings & Meanings:

キ

しる（す）

write down

Common Usage:

日記

記す

記憶

Examples:

彼に日記を盗み読みされた。

報告書にサインを記した。

そんなこと言ったかどうか記憶が定かでない。

Translations:

My diary was surreptitiously read by him.

I signed the report.

I don't have a clear memory of whether or not I said that.

Radical:

言, Gon-ben, is the radical.

己 is the phonetic, which is a pictograph of a pattern found on ancient pottery, originally meaning "arise" but came to mean "oneself."

If Kanji Networks is right about the meaning of 己 in 記, then the idea is "words that help raise clues/signs." An alternative idea would be that the words you write down are self-reflective.

References:

http://www.kanjinetworks.com/indices/radindex.html
http://www.thejapanesepage.com/node/kanji/7.htm