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I am reading about quadratic forms from class notes of a senior and I am not able to understand what this terminology means:

A quadratic form is universal over K if it represents all totally positive algebraic integers $\alpha \in {O_K}^{+}$.

But what is meant when a universal form is "ternary"?

Kindly tell.

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    @franzlemmermeyer well , I had searched google before posting this question and I searched again but I can't find the definition. If you were able to find the definition , can you just post here as comment or answer? –  Feb 06 '22 at 12:00
  • "ternary form" or "ternary quadratic form" –  Feb 06 '22 at 14:59

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It means that this quadratic form has 3 variables.