How do you write the equal-to symbol with delta on top ("delta-equal to")? One similar to http://www.decodeunicode.org/de/u+225c. Are special packages required for that?

It is supposed to be used for definition of equalities, similar to `:=`

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# Symbols – How to Use Delta-Equal to Symbol in LaTeX

relation-symbolssymbols

## Best Answer

How about

`\triangleq`

from the AMS fonts? Loading`\usepackage{amssymb}`

will make the command available