It means they threw your application into a:
1. any communal combination of resources, funds, etc. a typing pool
2. (Group Games / Gambling, except Cards) the combined stakes of the betters in many gambling sports or games; kitty
3. (Business / Commerce) Commerce a group of producers who conspire to establish and maintain output levels and high prices, each member of the group being allocated a maximum quota; price ring
4. (Economics, Accounting & Finance / Banking & Finance) Finance chiefly US
a. a joint fund organized by security-holders for speculative or manipulative purposes on financial markets
b. the persons or parties involved in such a combination
5. (Group Games / Billiards & Snooker) any of various billiard games in which the object is to pot all the balls with the cue ball, esp that played with 15 coloured and numbered balls; pocket billiards
vb (tr)
1. (Business / Commerce) to combine (investments, money, interests, etc.) into a common fund, as for a joint enterprise
2. (Business / Commerce) Commerce to organize a pool of (enterprises)
3. Austral informal to inform on or incriminate (someone) See also pools