These traditional units are often denoted by a capital letter M ( pronounced `` molar '' ) , sometimes preceded by an SI prefix , for example , millimoles per litre ( mmol/L ) or millimolar ( mM ) , micromoles/litre ( µmol / L ) or micromolar ( µM ) , or nanomoles/L ( nmol/L ) or nanomolar ( nM ) .
These units are often written with a capital letter M ( pronounced `` molar '' ) , sometimes preceded by an SI prefix , for example , millimoles per litre ( mmol/L ) or millimolar ( mM ) , micromoles/litre ( µmol / L ) or micromolar ( µM ) , or nanomoles/L ( nmol/L ) or nanomolar ( nM ) .