Shortness and brevity with

The kanji means short in physical length and duration, as well as lacking.

The standard readings are タン and みじかい, written 短い with い as okurigana.

Etymology

This kanji isa phono-semantic compound comprised of 矢 (arrow) as the semantic component and 豆 as the phonetic component (タン).

Length

(Hour hand)

短針(たんしん) means the short hand of a clock, which shows the hour.

It combines 短 (short) with 針 (pointer) to show the short pointing hand.

Manga panel from 怪盗セイント・テール showing example of Hidden behind the short hand with 短針.
怪盗セイント・テール » Volume 1 » Page 54

Asuka Jr. is tasked with guarding a jeweled tiara, which Saint Tail has stated her intention to steal. The owner tells Asuka Jr. it’s been hidden behind the short hand on a clock tower, so Asuka Jr. waits below the face of the clock for Saint Tail’s arrival. He tells the owner that Saint Tail will likely arrive precisely at 6 o’clock.

アスカ Jr.:
「ここから短針(たんしん)()がとどくのは(ろく)()だけです」
“The hour hand is only within reach from here at six o'clock.”
「ほかの時間(じかん)(はり)からティアラを(ぬす)みだすのは不可能(ふかのう)なんですよ」
“At any other time, it would be impossible to steal the tiara from the hand, you see.”
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(Shortest)

最短(さいたん) means shortest in distance or duration.

It combines 最 (most) with 短 (short) to show the shortest distance or duration.

Manga panel from くまぐらし showing example of Leaving the mountain at the shortest route with 最短.
くまぐらし » Volume 2 » Page 80

Kumada takes a trip to the mountain, in hope that the bear living in his apartment will follow him there, then he can run away and leave the bear stranded behind. He has with him his employee Sanami, an expert on mountains, to act as a guide. During their hike, Sanami asks Kumada why he’s placing beans on the ground as they go.

熊田(くまだ):
(かえ)りはこの(まめ)(たよ)りに最短(さいたん)ルートで()()りる」
“On the way back, I'll use these beans as a guide and run down by the shortest route.”
「そのための(しるし)だ」
“That's what the markers are for.”
砂波(さなみ):
普通(ふつう)下山(げざん)しましょうよ」
“Let's just go down the mountain normally.”
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Temperament

(Short temper)

短気(たんき) means a quick temper or impatience. As a な-adjective, it describes someone who gets angry or loses patience easily.

It combines 短 (short) with 気 (spirit) to show a temper with a short fuse.

Manga panel from ニコラのおゆるり魔界紀行 showing example of Short-tempered tribe with 短気.
ニコラのおゆるり魔界紀行 » Volume 1 » Page 44

Simon and Nicola stop at a pub for dinner. Their dinner conversation turns to Simon explaining the various temperaments of different tribes in the demon world.

サイモン:
「あのウロコがあって(きば)(するど)いのがガブール(ぞく)さ」
“Those ones with scales and sharp fangs are the Gabool tribe.”
短気(たんき)豪快(ごうかい)(こえ)がでかい」
“They're short-tempered, boisterous, and loud.”
ガブールⒶ:
(おれ)のだ!!」
“It's mine!!”
ガブールⒷ:
「うるせえ」
“Shut up.”
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