Mnemonic symbol: a Mohawk haircut. It fits the hair "to stand on end" and the character itself looks like a head with a Mohawk haircut facing towards the left.
James II of England (zh) tries out a Mohawk haircut (乍) in the ashram's bathroom (a4).
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A standard or guidon, as used in the military. Sherlock Holmes tries out his new guidon in the space station's bathroom. The standard features a capacitor and a daisy.