single letter
[ˈsɪŋɡəl ˈlɛtər]
nounpl: single letters
letra única / letra isolada
1. one individual character of the alphabet, standing alone or considered separately from others
The word 'cat' is made up of three single letters: c, a, and t.
A palavra 'gato' é composta por três letras únicas: g, a, t e o.
2. a character that represents a single sound or phoneme in written form
In cryptography, each single letter can be substituted with another letter.
Em criptografia, cada letra única pode ser substituída por outra letra.
3. an alphabetic symbol considered individually rather than as part of a word
The teacher asked students to identify each single letter in the sentence.
A professora pediu aos alunos que identificassem cada letra única na frase.
The term 'single letter' is used commonly in educational contexts in both Brazil and the USA for teaching literacy, phonics, and writing systems. In Portuguese-speaking countries, 'letra única' is the standard term used in schools when teaching alphabet recognition and spelling.
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