Two components of ${\mathrm{M}}_1$ measure of money supply :
${\mathrm{M}}_1=\mathrm{C}+\mathrm{OD}+\mathrm{DD}$
Where

$\mathrm{OD}=$ Other deposits
$\mathrm{DD}=$ Demand deposits held by commercial banks
$\mathit{O}\mathit{D}$ is the other deposits with the RBI. These are the demand deposits held by the RBI of all economic units except the government and banks. It includes demand deposits of public financial institutions (like IDBI, etc.), foreign Central Banks and government, IMF, World Bank etc. DD is demand deposits which means those deposits which can be withdrawn at any time by the account holders. Current account deposits are included in demand deposits.