In particular, I have a 5-character easy to spell meaningless name that I am reserving for some large scale service I will build in the future.
Getting an unregistered .com is tough, but many are available at a reasonable price on secondary market. I define reasonable price as under $1000. When I decided on the Sendlinks name, the seller originally wanted $5000. I made the decision to buy it at that price once I was ready to re-brand.
Since no one else would likely buy the name, I wasn't too concerned about someone taking it. Fast forward a few months later, I was at the point where I had money and so I decided to just buy it then and cross that item from my launch checklist. Luckily for me, the price dropped to $2000.
I own the .com domains of my Internet nickname and my last name among other properties.
There's still plenty of good ones left. I created a program to help me find them: https://github.com/jedberg/wordgen