Bogleheads

Are Jack Bogle disciples.

Here’s the full definition as defined by the Reddit Bogleheads forum:

Passive Indexing Community for Long-Term Lazy Investors

Bogleheads are passive investors who follow Jack Bogle’s simple but powerful message to diversify with low-cost index funds and let compounding grow wealth. Jack founded Vanguard and pioneered indexed mutual funds. His work has since inspired others to get the most out of their long-term investments. Active managers want your money – our advice: keep it! How? Investing in broad-market low-cost indexes, diversified between equities and fixed income. Buy, hold, pay low fees, and stay the course!

P.S. (Nothing in here is financial advice. Just use your common sense and apply due diligence.)