Type C
Direct Answer
Type C, the "Europlug," is the most widely accepted plug in the world by country count -- 2 round, slightly tapered pins, ungrounded, rated just 2.5A/250V. Its flexible pins give it a secure friction-fit in sockets built for several other, larger round-pin standards.
Source: EN 50075 / CEE 7/16
Specs
| Pins | 2 round pins, 4mm diameter, tapered/flexible |
| Rated Current | 2.5 A |
| Rated Voltage | 250 V |
| Grounded | No |
| Common Regions | Most of continental Europe, Russia, Turkey, Iran, Egypt, Indonesia, South Korea, and more |
The Most-Accepted Plug in the World
The Europlug's two round pins are deliberately tapered so they converge slightly toward the tip, giving the plug a firm friction grip in sockets built for several different, larger round-pin standards -- it fits safely into Type E, F, H, J, K, L, N, and O sockets, on top of its own native Type C sockets. That mechanical trick, not a formal cross-compatibility agreement, is the real reason the Europlug is usable in more countries than any other plug type: it's the default connector for small, low-power electronics and chargers worldwide.
Its rating is deliberately modest -- 2.5A at 250V -- reflecting its role as a low-power connector for lamps, chargers, and small appliances, not a general-purpose grounded plug. Being ungrounded and reversible (no fixed polarity), it carries no safety-ground path at all, which is acceptable only for double-insulated devices.