六
부수: 八
획수: 4획
六 simply means six.

六 = 六
X = unknown
How 六 came to represent ‘six’ is unknown. One theory suggests the original form depicted a person’s two thumbs and two index fingers pressed together creating an upward-pointing arrowhead shape. The renaming six fingers remain free (this makes sense if you try it yourself).
Others suggest that the character depicted a roof and this was a phonetic loan for a character meaning ‘clenched fist’, which was a way to count six on one hand.
Another theory suggests that 六 is simply a geometric symbol.
Mnemonic
The uncertainty surrounding the origin of 六 means there is no appropriate mnemonic.
One approach is to consider how 六 looks like the stick figure of the Blair Witch and relate this to the devil’s number ‘666’.
Vocab
六 | 육 | six |
六月 | 유월 | June |
六角形 | 육각형 | hexagon |
六感 | 육감 | sixth sense |
六甲 | 육갑 | the sexagenary cycle |
六大洲 | 육대주 | the Six Continents |
六書 | 육서 | the six categories of Chinese characters |
Other resources
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Bibliography
— Daum 사전, [s.v. 六].
— Grant, B.K. (1982). A Guide To Korean Characters: Reading and Writing Hangul and Hanja, [s.v. 62]. Seoul: Hollym.
— Outlier Dictionary of Chinese Characters, [s.v. 六].
— Seely, C., Henshall, K.G., & Fan, J. (2016). The Complete Guide to Japanese Kanji: Remembering and Understanding the 2,136 Standard Japanese Characters, [s.v. 80]. Singapore: Tuttle Publishing.