0,000000000000005:2

The expression you provided is "0,000000000000005:2".

Assuming the colon ":" signifies division, this can be interpreted as:

\[ \frac{0,000000000000005}{2} \]

Note that in many European countries, the comma is used as the decimal separator. Converting to a standard decimal notation:

\[ 0.000000000000005 \div 2 \]

Calculating this:

\[ 0.000000000000005 \div 2 = 0.0000000000000025 \]

Final answer:

\[ \boxed{0.0000000000000025} \]