Formally, the tilde is a symbol most often used to accent letters in words used in certain languages, such as in the Spanishseñor. However, you might also see the tilde used sometimes in informal writing as well.
Atilde is atypographical symbol that resembles a wavy line (~). In English, it has no accepted usage in formal writing, but it may occasionally be used for a few different reasons in informal writing. This symbol is also used in math, computer programming, and to form certain letters in Spanish and Portuguese.
The following examples show usage of the tilde in different circumstances.
In formal writing, you may need to use a tilde when referring to Spanish or Portuguese words. For example, the Spanishmañana (“morning, tomorrow”) and the Portugueseamanhã (“tomorrow”) are just two examples of words that use a tilde. When using a computer, most programs allow you to insert special characters (that combine the tilde with the appropriate letter) in order to type these words. When writing by hand, though, you will need to add a tilde.
In informal writing, a tilde is sometimes used before a number to mean “about” or “approximately.” For example, a sentence that readsI think my dog weighs ~20 pounds meansI think my dog weighs about/around 20 pounds. This usage is likely based on the math usage of the tilde symbol to mean an approximate equivalency.
In informal writing, a tilde (or multiple tildes) may be used at the end of a sentence to indicate a speaker is intending to be playful or flirty. You are most likely to encounter this usage on social media or in fanfiction writing. For example, you might see a social media post that looks like this:
Take this quiz to see how much you know about tildes and other typographical symbols.