Slowing job growth is one indication of a slowing global economy.

The September jobs report put U.S. unemployment at its lowest level in 50 years. But 136,000 new jobs were fewer than the Dow Jones consensus estimate projecting 145,000 last month. And record-low job numbers are historically a harbinger of recession ahead.

Meanwhile, September's ISM manufacturing index shows manufacturing is already in a recession. Production is at its weakest levels since 2009. Many analysts point the finger at Donald Trump's trade war with China for the weak manufacturing numbers.

Another interesting recession signal: Google Trends search interest for "recession" over the last 12 months went parabolic in August.