ICO Initial Coin Offering
ICO is an online crowdfunding event that allows investors to buy tokens directly from a seller or project at a pre-planned sale in exchange for either cryptocurrency or fiat currency.
IEO Initial Exchange Offering
IEO is a fundraising token sale administered by a cryptocurrency exchange on behalf of a seller or project. The coin or token will then be listed on the exchange.
STO Security Token Offering
An STO is a fundraising sale where the token sold represents an investment contract into an underlying asset or an ownership or tokenized share.
White Papers are easy to find since authors use them to describe and promote the projects they propose. Here are a few well known examples ranging from the elegantly simple to highly complex...
and some guidelines for writing them:
"Writers typically use this genre when they argue a specific position or propose a solution to a problem, addressing the audience outside of their organization."