"143" is a code for "I Love You". "1" means "I", "4" means "love", and "3" means "you". This is because 1 has one letter, 4 has four letters, and 3 has three letters, representing the phrase "I love you."

When to use it

People use '143' as a code to express love and affection towards someone. It is often used in text messages, social media posts, and other forms of online communication. The number '1' represents the letter 'I', '4' represents the number of letters in the word 'love', and '3' represents the number of letters in the word 'you'.

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Reference:

StackPath
Urban Dictionary: 143
1 4 3 indicates the number of letters in the words I love you