Source: /cirosantilli/phi

= Phi
{title2=$\Phi$}
{title2=$\phi$}
{title2=$\varphi$}
{title2=F}
{wiki}

Two lower case variants... both used in <mathematical notation>, and for some reason, in <LaTeX> `\varphi` is the one that actually looks like the default standard modern lowercase phi, while `\phi` is the weird one. I love life.