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Questions
14
  1. You can draw a text on a canvas and use the canvas as the source for THREE.CanvasTexture() object, which you can use in the .map parameter of a material for a mesh with THREE.PlaneGeometry() or THREE.PlaneBufferGeometry().
  2. You can use THREE.TextGeometry() or THREE.TextBufferGeometry().
  3. You can create your own symbols of numbers, like @hofk did in his projects (link1 and link2).

Take time to make some researches and studies to choose the most appropriate method. So far, you question is too broad to answer.