I have four Apple button designs in my collection that are rectangle or square.
Power Macintosh (c. 1995) This button is 5.4×5.4 cm, featuring an image of a 1995-era Power Macintosh computer and Apple monitor over a background of flames with the words Power Macintosh in the Apple Garamond font.
Windows 95 = Macintosh ‘89 (c. 1995) This button is black and white and measures 5.2×7.8 cm, featuring the classic multicolor Apple logo along with the words Windows 95 = Macintosh ’89 in the Apple Garamond font.
Yum. (c. 1999) This button is white and measures 5.2×7.8 cm, featuring the word Yum. in the Apple Garamond font and five iMac computers in all five colors, tangerine, lime, strawberry, blueberry, and grape.
G5 It’s here. (2005) This button is black and measures 5.2×7.8 cm, featuring the G5 logo and the words It’s here. in the Myriad Apple font.
The iMac G3/333 featured a 333 MHz PowerPC 750 (G3) processor, 32 MB of RAM, and a 6.0 GB EIDE hard drive. The screen was a 15-inch CRT display.
This iMac was offered in five different colors: lime (lime green), strawberry (pinkish-red), blueberry (bright blue), grape (purple), and tangerine (orange-yellow). The previous version of this iMac was offered in the exact same colors.
Apart from the faster 333 MHz processor, this iMac was identical to the iMac G3/266 before it.
The iMac G3/266 featured a 266 MHz PowerPC 750 (G3) processor, 32 MB of RAM, and a 6.0 GB EIDE hard drive. Its screen was a 15-inch CRT display.
This iMac was offered in five different colors: lime (lime green), strawberry (pinkish-red), blueberry (bright blue), grape (purple), and tangerine (orange-yellow). Previously, the iMac was available only in Bondi blue (blue green).
This iMac is grape.
The iMac G3/266 models had similar specifications to the Revision B iMac line before, but shipped with a larger 6.0 GB hard drive and lacked the “Mezzanine” internal expansion slot and IrDA.
After the original iMac which was available only in “Bondi” blue, a second and third generation of CRT iMac using the same basic design became available in five colors. While the original Bondi blue Mac was a greenish blue and named after a popular Australian surfing beach, the second and third generation were named for fruit colors: lime, strawberry, blueberry, grape, and tangerine. Although the colors were named for fruits, the shades were arguably unfruitlike. Like the original iMac, the case was translucent, rather than completely transparent.
This blueberry iMac example is a G3/333MHz model very similar to the 266 MHz “Revision B” iMac that preceded it in the same year (1999). This iMac G3/333 had a larger hard drive and lacked the “Mezzanine” port.
Also note that this iteration of iMac included a matching Apple USB Keyboard (M2452) and Apple USB Mouse (M4848). The mouse was often criticized for its circular, “hockey puck” shape with critics claiming it was difficult to locate the top button since the shape was a circle. In this revision, Apple added a dimple to the top of the mouse to help address this issue.