咔

kǎ = k + a3

(used as phonetic "ka")

咔 character breakdown

咔
- 卡
  - 上
    - 一
    - 丨
    - 二
      - 一
    - 丄
      - 一
      - 丨
  - 卜
    - 丨
    - 丶
- 口

kǎ = k + a3

to stop / to block / (computing) (coll.) slow / (loanword) card / CL:張|张[zhang1],片[pian4] / truck (from "car") / calorie (abbr. for 卡路里[ka3 lu4 li3]) / cassette

卡 = 上 + 卜 : Karl Marx (k) wants to destroy capitalism by crushing credit cards (卡) with a voodoo staff (卜) and by stomping on (上) them in the ashram (a3).

卡

qiǎ = qi + a3

to block / to be stuck / to be wedged / customs station / a clip / a fastener / a checkpost / Taiwan pr. [ka3]

口

kǒu = k + ou3

mouth / classifier for things with mouths (people, domestic animals, cannons, wells etc) / classifier for bites or mouthfuls

Mnemonic symbol: 口 shall be represented by a mandarin. Karl Marx (k-) is enjoying a mandarin in the outhouse's living room (ou3).