In the mobile technology industry, the term "ROM" is often used to refer to flash memory. This is not technically accurate, but it is relatively common.
See: Flash Memory
Strictly speaking, ROM means memory that is read-only, meaning data stored in it cannot be changed, or can only be changed via a special, slow process that is not designed to be used frequently.
Software stored in ROM is often called "firmware", because it is not as easily updated as other software, so it is, in a way, "in-between" software and hardware.