The iPhone took the world by storm when it debuted in 2007 and its popularity has shown no signs of slowing down.

But, even if you do have one, can you confidently say you know what that now-iconic letter ‘I’ stands for?

Your first guess might be ‘Internet,’ since the iPhone’s claim to fame is its ability to access the Web. Or maybe you think it means ‘I’ as in the personal pronoun ‘I’, since you can personalise your smartphone with the apps and features of your choice.

But you’ll be surprised to know that there is not one but five different I-words that the ‘I’ in iPhone represents.

That little ‘I’ actually got its start long before the iPhone became a reality.

The first Apple product with an ‘I’ in its name was the iMac computer, released back in 1998.

Never mind phones that could access the Internet—back then, computers that could do so were a rarity.

So the ‘I’ originally stood for Internet, to highlight the Mac’s revolutionary Internet capacities.

But when that first iMac launched, the ‘I’ had several other meanings as well.

When Steve Jobs introduced the iMac, he displayed a presentation with not one but five potential I-meanings.

“Steve Jobs said the ‘I’ stands for ‘internet, individual, instruct, inform, [and] inspire’,” Paul Bischoff, a privacy advocate at Comparitech, explains.

However, while these words were important part of the presentation, Mr Jobs also said that the ‘I’ “didn’t have an official meaning,” Bischoff continues.

“He also alluded to it referencing ‘I’ as a personal pronoun, and ‘instruction’ for education purposes.” So it seems the ‘I’ is open to Interpretation.

Though the ‘I’ got its start as ‘Internet,’ and it’s true that Internet access was the iPhone’s biggest selling point when it debuted in 2007, some Apple products with I-names didn’t even have Internet access (think the early iPod!).

So the ‘I’ isn’t so much representative of a single shortened word as it is a memorable—dare we say Iconic—brand identifier.