卓

卓 = ⺊ + 早 : Mnemonic symbol: a 班 ban1 卓 zhuo2 琴 qin2, a banjo. Julian Giant Squid (zhu) is taking part in a music contest in the observatory's kitchen (o2). There is an alarm clock (早) with a pennant on it (⺊) which shows exactly the time when Julian Giant Squid is allowed to play. As the pennant goes up Julian Giant Squid starts to play, and he proves that his banjo skills are really outstanding (卓).

早 = 十 + 日 : Mnemonic symbol: your very own annoying alarm clock going off in the morning.

The sun (日) is rising above Zorro's (z) alarm clock (早) in the aorta's living room (ao3), but Zorro just smashs it with a big cross (十).

⺊ = 丨 + 一 : Mnemonic symbol: ⺊ looks a bit like a pennant.

Someone stuck a flute into the middle of a hollow dinosaur bone to conduct studies on the speed of sound. At the one end of the hollow dinosaur bone is an answering pennant, used in the International Signal Code primarily for the reply "signal is received and understood", which should be raised as soon as the person is hearing the sound made by the flute.