I refer to the post on TechGYD (technology blog) on the creation of logos. These days many designers create logos based on its aesthetics value and less of the meaning behind it. What exactly makes up a good logo? Is it one with copious compliments or one with the right meanings behind it? Or is it how it was envisioned in the first place? Regardless, as creatives, one of the main things that significantly makes up a perfect logo is one that is not only brilliant in design, but also one with meanings so sophisticated yet meaningful for the brand they represent. Check out the link here from tech blog and see what these logos represents. Personally, I love the Apple logo and how it was created, along with IBM, Baskin Robbins, Unilever and Toyota.
Zack Chia 
I love that unilver logo, Also the arrow in fedex was so impressive to me ( I know you didn’t include it but its in that vein of effective logos)
Yes, that too is very clever. Again, these are really brilliant work that truly stood through the test of time.