The pronoun 数 "several"
The pronoun 数 is a synonym of the pronoun 几 in written language.
The pronoun 数 
is used in written Chinese to indicate an unspecified amount of something.
is used in written Chinese to indicate an unspecified amount of something. Pay attention
数 is placed before a noun, with a classifier placed in between.
Examples
他们数周在炮火中
They were under fire for several weeks
tāmen shù zhōu zài pàohuǒ zhōng
他们会使申请耽搁数月之久
They can delay applications for months
tāmen huì shǐ shēnqǐng dāngē shù yuè zhī jiǔ
有数个弹劾的理由
There are several grounds for impeachment
yǒu shù ge tánhé de lǐyóu