Impede que o conector seja conectado em receptáculo indevido

www.linguee.com.br/ingles-portugues/traducao/were coded.htm...
Montar os dois pinos de codificação no bloco de conectores conforme a "Tabela ... estão codificadas contra conexão incorreta e contra inversão de polarização.

Sugestão, pela figura me parecem alças muito pequenas que se assemelham a dedos, por isso talvez chamaria de "dedos" mesmo.

finger [ˈfɪŋgə]
n
1. (Life Sciences & Allied Applications / Anatomy)
a. any of the digits of the hand, often excluding the thumb Technical name digitus manus
b. (as modifier) a finger bowl
c. (in combination) a fingernail Related adj digital
2. (Clothing & Fashion) the part of a glove made to cover a finger
3. something that resembles a finger in shape or function a finger of land
4. (Mathematics & Measurements / Units) Also called digit the length or width of a finger used as a unit of measurement
5. (Miscellaneous Technologies / Brewing) a quantity of liquid in a glass, etc., as deep as a finger is wide; tot
6. (Engineering / Mechanical Engineering) a projecting machine part, esp one serving as an indicator, guide, or guard
burn one's fingers to suffer from having meddled or been rash
get or pull one's finger out Brit informal to begin or speed up activity, esp after initial delay or slackness
have a (or one's) finger in the pie
a. to have an interest in or take part in some activity
b. to meddle or interfere
lay a finger on (usually negative) to harm
lay or put one's finger on to indicate, identify, or locate accurately
not lift (or raise) a finger (foll by an infinitive) not to make any effort (to do something)
let slip through one's fingers to allow to escape; miss narrowly
point the finger at to accuse or blame
put the finger on Informal
a. to inform on or identify, esp for the police
b. to choose (the victim or location of an intended crime)
twist or wrap around one's little finger to have easy and complete control or influence over