fixed some section titles
===Fourth logo (1986-1990)===
The fourth Viacom logo was used from 1986 to 1990. Its nickname is "The V of Steel". This logo consists of the Viacom "V" shape with the word "Viacom" below it, just like the previous logo, and has a fading purple background. The logo starts sideways, and then rotates 90 degrees as the screen zooms out. The logo then glimmers from side to side, and there is a shining effect behind it. A synthesizer piece with alternating high and low notes in the foreground and a continuous secondary note in the background plays during this logo, and a glimmering effect in the audio is heard in sync with the glimmering on the logo.
===[[File:Hqdefault_(3).jpg|thumb|The 1990-1999 Viacom logo.]]===▼
Fifth logo (1990-1999)▼
===[[File:Hqdefault_(3).jpg|thumb|The 1990-1999 Viacom logo.]] ===
▲Fifth logo (1990-1999)
The fifth Viacom logo was used from 1990 to 1999. Its nickname is "Wigga Wigga" because of a sound effect in the background audio. This logo consists of a zig-zag line of a fading blue background, which then separates into the individual letters of the word "VIACOM" in all uppercase. The letters then zoom out and come together to speel out "VIACOM", and then some of the letters shine while an announcer in the background says "Viacom". The original background music in this logo was a flute piece, but in 1992 it was replaced with an upbeat rock-style tune with the aforementioned "wigga-wigga" sound effect playing as the zig-zag line turns into the word "VIACOM".
The sixth Viacom logo was used from 1999 to 2005. Its nickname is "Viacom 2000". This logo is similar to the "Wigga Wigga" logo. It consists of the words "VIACOM PRODUCTIONS" in all uppercase letters zooming in on a dark blue background. The letters then spread out and stop above a line with the statement "A Paramount Company" below it. The background audio is a futuristic-sounding keyboard piece that starts with a booming note and ends with short, repetitive ambient notes. A robotic voice says "Viacom" in the middle of the logo along with the music piece. This was the last logo of the original Viacom Company before CBS purchased them and Paramount.
The seventh and current Viacom logo has been in use since 2005. This is the first logo of the new Viacom, which is a separate company from the one that made the six logos mentioned above. It consists of the word "Viacom" in orange on a white background in a fixed position. This logo has no background audio. A variant of this logo has the word "Viacom" with a color-changing effect.