The cubic centimetre (or cubic centimeter; US spelling) is a unit of volume and is derived from an SI unit with the symbol cm³.
There are 1000cm³ in 1 litre. 1 cubic inch is equal to 16.38706cm³.
The cubic centimetre is sometimes referred to as cc or ccm - for example when administering drugs in a liquid solution. This is due to its relatively small size.
It is also often used in the 'cc' form to express the size of a petrol or diesel engine and represents the total displacement volume of the engine.
The cubic yard is a unit of volume derived from the imperial system of units. It uses the symbol yd³.
It equals the volume of a cube with edges that each measure 1 yard. It is equivalent to 27 ft³, 46656 in³ or ≈ 0.764554 m³.
The yard (and derivatives like the cubic yard for example) are the same in both the imperial systems and US customary systems so require less conversion systems to calculate / convert to SI or metric.