This logo was used on early products. The characters are Nin, ten, and do. All in order. This is way before the switch from cards to electronic toys and games.
Nintendo Playing Card Co.
By this point, Nintendo's wordmark began to bear, more or less, a resemblance to what it is today.
This logo was shaped as a hexagon and was used in toys.
The shape was changed to rounded rectangle, which would become the main design for over 40 years.
This logo was adopted when Nintendo became an electronic game company.
The logo's color was changed from red to gray. The red logo is still used in some cases.
As of April 2016, the red color scheme has been re-introduced on Nintendo's YouTube and Twitter pages.