\starttext

\startformula[-]
    \startalign
    \NC \text{integral}         \NC \int_{a}^{b}    \NR
    \NC \text{double integral}  \NC \iint_{a}^{b}   \NR
    \NC \text{triple integral}  \NC \iiint_{a}^{b}  \NR
    \NC \text{contour integral} \NC \oint_{a}^{b}   \NR
    \NC \text{surface integral} \NC \oiint_{a}^{b}  \NR
    \NC \text{volume integral}  \NC \oiiint_{a}^{b} \NR
    \stopalign
\stopformula

\stoptext
