19 (number)
From Tardis Wiki, the free Doctor Who reference
19 was a number.
The Rani's time brain thought that 87K to the power of 19E correlated with 52 to the power of 6.4 equals 29V. The Seventh Doctor corrected it to 39. (TV: Time and the Rani)
Rose Tyler was nineteen years old. (TV: Rose, Dalek, PROSE: Rose Tyler)