\documentclass{article}
\usepackage[T1]{fontenc}
\begin{document}
\begin{tabular}{llll}
& 1.2 & -1.2 & \{-1.2\} \\
normal:& ${}>1.2$ & ${}>-1.2$ & ${}>-1.2$\\
ord: & $\mathord{>}1.2$ & $\mathord{>}-1.2$ & $\mathord{>}{-1.2}$\\
ord +,:& $\mathord{>}\,1.2$ & $\mathord{>}\,-1.2$ & $\mathord{>}\,{-1.2}$\\
\end{tabular}
\end{document}